linux-kernel - Re: [PATCH v4 0/5] PCI: Add support for PCI Enhanced Allocation "BARs"

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Date:	Fri, 2 Oct 2015 16:47:55 -0700
From:	"Sean O. Stalley" <sean.stalley@...el.com>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rafał Miłecki <zajec5@...il.com>,
	linux-api@...r.kernel.org, yinghai@...nel.org,
	rajatxjain@...il.com, gong.chen@...ux.intel.com,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v4 0/5] PCI: Add support for PCI Enhanced Allocation
 "BARs"

Hi David,

I did a quick look through & overall I what you have done.
I will try to find some time to do a full review early next week.

Thanks Again,
Sean

On Fri, Oct 02, 2015 at 03:37:51PM -0700, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> The original patches are from Sean O. Stalley. I made a few tweaks,
> but feel that it is substancially Sean's work, so I am keeping the
> patch set version numbering scheme going.
> 
> Tested on Cavium ThunderX system with 4 Root Complexes containing 50
> devices/bridges provisioned with EA.
> 
> Here is Sean's description of the patches:
> 
> PCI Enhanced Allocation is a new method of allocating MMIO & IO
> resources for PCI devices & bridges. It can be used instead
> of the traditional PCI method of using BARs.
> 
> EA entries are hardware-initialized to a fixed address.
> Unlike BARs, regions described by EA are cannot be moved.
> Because of this, only devices which are permanently connected to
> the PCI bus can use EA. A removable PCI card must not use EA.
> 
> This patchset adds support for using EA entries instead of BARs
> on Root Complex Integrated Endpoints.
> 
> The Enhanced Allocation ECN is publicly available here:
> https://www.pcisig.com/specifications/conventional/ECN_Enhanced_Allocation_23_Oct_2014_Final.pdf
> 
> 
> Changes from V1:
> 	- Use generic PCI resource claim functions (instead of EA-specific functions)
> 	- Only add support for RCiEPs (instead of all devices).
> 	- Removed some debugging messages leftover from early testing.
> 
> Changes from V2 (By David Daney):
> 	- Add ea_cap to struct pci_device, to aid in finding the EA capability.
> 	- Factored EA entity decoding into a separate function.
> 	- Add functions to find EA entities by BEI or Property.
> 	- Add handling of EA provisioned bridges.
> 	- Add handling of EA SRIOV BARs.
> 	- Try to assign proper resource parent so that SRIOV device creation can occur.
> 
> Changes from V3 (By David Daney):
> 	- Discarded V3 changes and started over fresh based on Sean's V2.
> 	- Add more support/checking for Entry Properties.
> 	- Allow EA behind bridges.
> 	- Rewrite some error messages.
> 	- Add patch 3/5 to prevent resizing, and better handle
>           assigning, of fixed EA resources.
> 	- Add patch 4/5 to handle EA provisioned SRIOV devices.
> 	- Add patch 5/5 to handle EA provisioned bridges.
> 
> David Daney (3):
>   PCI: Handle IORESOURCE_PCI_FIXED when sizing and assigning resources.
>   PCI: Handle Enhanced Allocation (EA) capability for SRIOV devices.
>   PCI: Handle Enhanced Allocation (EA) capability for bridges
> 
> Sean O. Stalley (2):
>   PCI: Add Enhanced Allocation register entries
>   PCI: Add support for Enhanced Allocation devices
> 
>  drivers/pci/bus.c             |   7 ++
>  drivers/pci/iov.c             |  11 ++-
>  drivers/pci/pci.c             | 202 ++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/pci.h             |   1 +
>  drivers/pci/probe.c           |  34 ++++++-
>  drivers/pci/setup-bus.c       |  63 ++++++++++++-
>  include/linux/pci.h           |   1 +
>  include/uapi/linux/pci_regs.h |  44 ++++++++-
>  8 files changed, 355 insertions(+), 8 deletions(-)
> 
> -- 
> 1.9.1
> 
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